HstLinkProcessor using HstRequestContext#getSession() leads to jcr session leak

Reproduce steps:

1. Take the MyHippoProject
2. Create a HstLinkProcessor and add this code:

       @Override
       protected HstLink doPreProcess(HstLink link) {
           try {
               RequestContextProvider.get().getSession();
           } catch (RepositoryException e) {
               e.printStackTrace();
           }
           return link;
       }
   

3. Now, hit "http://localhost:8080/site/" more than 100 times.
   You'll see after 100 times you'll get javax.jcr.RepositoryException: org.hippoecm.hst.core.jcr.pool.NoAvailableSessionException: No session is available now. Probably the session pool was exhausted.